No running a/c hasn't been that hot yet. I had it timed once before I got all my injectors done with that autozone pump. It never smoked after that. Now it seems it smokes more. It's grey whitish/black smoke coming out. I figured I give this pump one more shot before I swap it out. I was trying to wait to swap it out til I got my turbo because it's the bigger pump. Its the Rd2 80.